If Delta U and Delta W represent increase in internal energy and work done by system respectively in

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11.Thermodynamics

easy

If $\Delta U$ and $\Delta W$ represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?

A

$\Delta U = - \Delta W$ in an adiabatic process

B

$\Delta U = \Delta W$ in an isothermal process

C

$\Delta U = - \Delta W$ in an isothermal process

D

$\Delta U = \Delta W$ in an adiabatic process

(AIPMT-1998) (AIPMT-2010)

Solution

(a)According to the first law of thermodynamics
$\Delta Q = \Delta U + \Delta W$
In adiabatic process $\Delta Q = 0$, hence $\Delta U = – \Delta W$

Standard 11

Physics

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